// Copyright 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Printf variants that place their output in a C++ string.
//
// Usage:
//      string result = StringPrintf("%d %s\n", 10, "hello");
//      SStringPrintf(&result, "%d %s\n", 10, "hello");
//      StringAppendF(&result, "%d %s\n", 20, "there");

#ifndef STRING_PRINTF_H_
#define STRING_PRINTF_H_

#include <stdarg.h>
#include <string>

#include "base/port.h"
#include "base/types.h"

namespace sling {

// Return a C++ string.
extern string StringPrintf(const char *format, ...) ABSL_PRINTF_ATTRIBUTE(1, 2);

// Store result into a supplied string and return it.
extern const string &SStringPrintf(string *dst, const char *format, ...)
    ABSL_PRINTF_ATTRIBUTE(2, 3);

// Append result to a supplied string
extern void StringAppendF(string *dst, const char *format, ...)
    ABSL_PRINTF_ATTRIBUTE(2, 3);

// Lower-level routine that takes a va_list and appends to a specified string.
extern void StringAppendV(string *dst, const char *format, va_list ap);

}  // namespace sling

#endif  // STRING_PRINTF_H_

